Portable lifting device



Dec. 9, 1958 A. LANDsKRoNr-:R ETAL 2,863,569

PORTABLE LIFTING DEVICE Filed oet. 22, 195e Dec 9, 1958 A. LANDSKRONERETAL 2,863,569

PORTABLE LIFTING DEVICE 2 Sheets-Sheet 2 Filed Oct. 22, 1956 nitedStates Patent j 2,863,569 PORTABLE LrFrING DEVICE Abraham LandskronerandS'amuel Landskroner, BalIimore,Md.

Application ctober 22, 1956,.Serial No. 617,331

SfClaims. v(Cl'. 2121-71) This invention relates to lifting devices, andmore particularly to a portablelifting device, or hoist which can beutilized forv lifting; objects through windows, from and into trucks,and the like.

For a long time there has been a long felt yneed for a portable. liftingdevicev or hoist which can be utilized effectively and efficiently forlifting and moving objects of various sizes Vand shapes. througha windowfrom or to a street, or in moving objects from or to a truck or freightcar, to name only `a few uses of such a device. Most of the liftingdevices, hoists, derricks that have been developed in the past arecumbersome, difficult toassemble and disassemble, and are not eflicientand reliable in operation.

It is one of the objects of this invention to provide a novel liftingdevice which can be used effectively and efficiently to lift and. moveobjects of various sizes and shapes..

Still another object of this invention is to provide a portable liftingdevice or hoist which can ibe utilized under varied conditions toeffectively and efficiently lift loads of various weights and sizes.

And still another object of this invention is to provide a portablelifting device or hoist which is economical tomanufacture, efficient andreliable in operation, and which is easy toinstall, maintain, anddisassemble.

And even still another object of this invention is to provide a portablelifting device or hoist which may be easily applied to a window casingto lift heavy objects through a window above street level.

To provide a portable lifting device which is compact and easy toassemble and disassemble, are other objects of this invention. t

Still another object of this invention is to provide a lifting devicewhich can be readily adjusted to fit windows of Vvarious sizes.

To provide a portable lifting device which can be rapidly removed from.one windowl and installed 1n another window with a minimum of effort,is still another object of this invention. l

Still other objects of this invention are to provide lifting devices orhoists which are rugged, sturdy, and which will take a great deal ofpunishment without damage thereto.

To provide a portable lifting device which can be used in conjunctionwith a track and carriage to move objects of various sizes and shapes,is even still another object of this invention.

These and other objects and advantages of this invention will becomemore apparent from the following description and drawings in which:

Fig. l is a side elevation of the portable lifting device comprisingthis invention mounted in an operative position in a window;

Fig. 2 is a front elevation of the portable lifting device shown in Fig.l without the block and tackle;

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Fig. 3 is a longitudinal section taken along line 3-3 of Fig. l;

Fig. 4 is a longitudinal section taken along line 4-4 of Fig. 1;

Fig.V 5 is a modification for the arrangement for clamping the device toa window;

Fig. 6 is a side elevation of a second embodiment of the portablelifting device comprising this invention, illustrating the device inconjunction with a track and carnage;

Fig. 7,is an end view of a portion of the portable lifting deviceillustrated in Fig. 6;

Fig. 8 is a cross section taken on line 8-8 of Fig. 6; and

Fig. 9 is a cross section taken on line 9--9 of Fig. 6.

Referring now to Figs. l to 5 of the drawings, there is illustrated oneembodiment of the invention comprising a portable lifting device orhoist 11 for moving objects of various sizes and shapes from or into abuilding through a window 10 installed in a wall 12. It is to be notedthat this invention is not limited to lifting loads through windows,because it can be readily adapted to a widey variety of other uses whereit is desired to move heavy loads. The window 10, as shown in Figs. land 2, consistsof a stool 10, a head 16, and window guides 18.

The lifting device 11 consists of two main metal members 2li, preferablyof tubular cross section, having a topV angular portion 28 formedintegral with members 20. The two main members 20 have two base members22 which are mounted concentrically therewith at their lower ends. Thesemembers 22 will be described more in detail subsequently.

In` addition, the lifting device 11 consists of a cross member 24 whichis fastened to and pivoted at point 52 to a member 62. Member 62, inturn, is welded to the upper end of the top angular portion 28 oftubular members 20. As shown best in Fig. l, a second member 54 issecured by welding or the like to the top angular portion 28 of the mainmembers 20 and it extends outwardly and substantially in line with crossmember 24 and member 62. This member 54 has an aperture 56 in itsoutermost end for receiving a block and tackle arrangement 70.

As seen best in Figs. l and 3, the innermost end of cross member 24 isprovided with an elongated collar 48. This cross member 24 has a head 50secured thereto to prevent the cross member 24 from slipping out of Vthecollar 48. A top base support 42 is used for holding the cross arm 24 inposition at the head 16 of the window 10. The lower end 66 of the topbase support 42 has an aperture or opening provided therein forreceiving and supporting the collar 48 of the cross member 24. Thecollar 48 as well as the cross member 24 are secured in operativeposition by set screws 46 received in a threaded aperture 68 in thelower end 66 of the base support 42. The top base support 42 is providedwith a felt member 44 to prevent the apparatus from, injuring the wall12. The top base support 42, therefore, is used to support the portablellifting device or hoist 11 against the head 16 of the window.

Two cross support members 26 are secured to the collar 48 and the twomain members 20. The ends of the cross members 26 are secured to weldedrings 58 and 60 on the main members 2b and collar 48, respectively.These cross support members 26 are utilized to add rigidity to theportable lifting device or hoist 11.

Referring now to Figs. l, 2 and 4, the lower ends of the main supportmembers 20 are provided with concentric base members 22. At the upperend of each base member 22, there is provided a collar lock 34. Inaddition, a collar lock 38 is provided on each main member 20 next tothe collar lock 34. A threaded aperture 64 is formed in collar lock 34,and it receives a screw 36 for locking collar lock 34 to the Ibasemember 22. In addition, collar lock 38 is provided with a screw 40 forlocking collar lock 38 to the main member 20. A series of threadedapertures can be provided in members 20 and 22 for receiving the screwsfor securing the collar locks 34 and 38 in various positions along themembers 20 and 22.

l Referring now to Fig. of the drawings, there is shown a modificationof the arrangement for clamping the portable lifting device or hoist 11to the window. In addition to the xed top base support 42, a slidingclamp 72, having a finger or arm 74 and an enlarged apertured portion75, can be used to help secure the device to the head 16 of the window10 and the wall 12. In this arrangement, a plurality of apertures 78 areprovided in the cross member 24 for receiving screws 76 mounted in theenlarged apertured portion 75. Thus, the cross member 24 can beadjustably secured to vario-us size windows.

The lower end of each base member 22, as shown best in Figs. 1 and 2, isprovided with a base support 30 including a toe 32 for positioning thebase supports against the stool 14 of the window 10. By means of thisarrangement, the portable lifting device or hoist 11 is prevented fromslipping from the stool 14 of the window.

Referring now to Figs 6 to 9, there is illustrated a modified form ofthe invention wherein two portable lifting devices 11 are utilized, oneon the outside of the Window and the other on the inside of the window,for both lifting a heavy load and for moving the heavy load through thewindow to the inside of the building. In this arrangement, two identicalframeworks A and B, as previously described in connection with theembodiment of the invention in Figs. 1 to 5 are used, except for theelimination of the following components, namely the cross supportmembers 26, the welded rings 58 and 60, the extension member 54, and thecap 50 from the cross member 24.

As best seen in Fig. 6, the rod 24 is extended through the collar 48 sothat it can 'be secured at point 52 to the welded member 62 of the upperend of the top angular portion 28 of the main members 20, correspondingto the device A. In addition, two top base supports 42 are used tosupport the collar 48 as previously described, one in the inside of thewindow 10 and the other on the outside of the window.

Belo-w the cross arm or member 24, there is positioned A plurality ofbrackets 90 are provided on. the cross member 90 to hold the T-bar 80 inan operative position. These brackets 90 are secured at their lower endsto the T-bar 80 by suitable screws 92. In addition, the top basesupports 42 are provided with extensions and these extensions aresecured to the T-bar 80 by screws 96.

In actual operation, either embodiment of the portable lifting device 11is |mounted in a window, as previously described, and the desired loadis secured to the block and tackle arrangement 70. The load is lifted bythe block and tackle arrangement 70 to the proper height, and then it istaken by hand from the arrangement or it is moved into the building bythe arrangement as described in connection with Figs. 6 to 9.

The various parts can be manufactured of light weight metal, such asaluminum, or heavier metal, such as steel.

Obviously many modifications and variations of the present invention arepossible in light of the above teachings. It is, therefore, to beunderstood that within the scope of the appended claims the inventioncan be practiced otherwise than as specifically described.

What is claimed is:

1. A lifting device, comprising, structure defining at least twotelescopic frameworks, each said framework including a pair of spacedlegs with a V-shaped section secured to the upper ends of said pair oflegs, means including a cross member having its ends secured to theupper ends of said V-shaped sections, the lower ends of said frameworksbeing spaced from each other, said frameworks ibeing arranged so thatthe distance between the upper ends of said V-shaped sections is greaterthan the distance between the lower ends of said frameworks,

i means including a track extending below said cross member andextending on past said V-shaped sections, a carriage arranged formovement on said track, and block and tackle means secured to saidcarriage.

2. An arrangement as set forth in claim 1, and means for adjusting thelength of said cross member.

3. An arrangement as set forth in claim 1, and means for adjusting thelength of each leg of said pairs of frameworks.

4. An arrangement as set forth in claim 1, and means for securing saidtrack to said cross member.

5. An arrangement as set forth in claim l, and means including at leastone clamp for securing said device to the head of a window frame.

References Cited in the tile of this patent UNITED STATES PATENTS337,225 Anderson Mar. 2, 1886 974,381 Hogston Nov. 1, 1910 1,646,133Bechman Oct. 18, 1927 FOREIGN PATENTS 748,141 Great Britain Apr. 25,1956 827,707 Germany Ian. 14, 1952

